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Finding the Fourth Proportional to 99.30, 137.15 and 68.31

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Solution

The fourth proportional to 99.30, 137.15 and 68.31 is: 94.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.30 : 137.15 = 68.31 : x
  2. Step 2: Convert to fraction form
    99.30/137.15 = 68.31/x
  3. Step 3: Cross multiply
    99.30x = 137.15 × 68.31
  4. Step 4: Simplify right side
    99.30x = 9,368.37
  5. Step 5: Solve for x
    x = 9,368.37/99.30
  6. Step 6: Final answer
    x = 94.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.